Android 高仿微信朋友圈动态支持双击手势放大并滑动查看图片效果

最近参与了开发一款旅行APP，其中包含实时聊天和动态评论功能，终于耗时几个月几个伙伴完成了，今天就小结一下至于实时聊天功能如果用户不多的情况可以scoket实现，如果用户万级就可以采用开源的smack + opnefile实现，也可以用mina开源+XMMP,至于怎么搭建和实现，估计目前github上一搜一大把，至于即时通讯怕误人子弟，暂且不做介绍，现就把实现的一个微信朋友圈的小功能介绍一下。

先上效果图:

一拿到主流的UI需求，大致分析下，需要我ListView嵌套Gridview，而gridView的行数也和图片总数有关系，因此通过个数我们可以动态设置条目的宽高，而点击图片放大我们可一跳转到另一界面，图片左右滑动可以用viewpager实现，双击图片放大和手指缩放图片也可以用就监听手势进行不断放大，对于安卓事件不熟悉的朋友可以直接使用一个著名的photoVIew开源项目，支持手势缩放图片和滑动图片实现画廊功能，也很好的解决了内存溢出问题。

一配置ImageLoader

本项目中加载网络图片我就直接使用imageLoader，但建议还是去看下源码，因为开源项目本身自带缓存机制，有很好的缓存技巧，有很多东西值得我们借鉴。其不仅可以加载本地图片(文件path)，也支持加载网络图片（url），并且自带防止内存溢出功能。

public class MyApplication extends Application { 
  @Override 
  public void onCreate() { 
    super.onCreate(); 
    DisplayImageOptions defaultOptions = new DisplayImageOptions 
        .Builder() 
        .showImageForEmptyUri(R.drawable.empty_photo)  
        .showImageOnFail(R.drawable.empty_photo)  
        .cacheInMemory(true) 
        .cacheOnDisc(true) 
        .build(); 
    ImageLoaderConfiguration config = new ImageLoaderConfiguration 
        .Builder(getApplicationContext()) 
        .defaultDisplayImageOptions(defaultOptions) 
        .discCacheSize(50 * 1024 * 1024)// 
        .discCacheFileCount(100)//缓存一百张图片 
        .writeDebugLogs() 
        .build(); 
    ImageLoader.getInstance().init(config); 
  } 
}

二准备主界面和需要的基础类

1 Listadapter

public class FridListAdapter extends BaseAdapter{ 
  private ArrayList<MyBean> mList; 
  private LayoutInflater mInflater; 
  private Context mContext; 
  public FridListAdapter(Context context,ArrayList<MyBean> list) { 
    mInflater = LayoutInflater.from(context); 
    mContext=context; 
    this.mList=list; 
  } 
  @Override 
  public int getCount() { 
    return mList==null?0:mList.size(); 
  } 
  @Override 
  public MyBean getItem(int position) { 
    return mList.get(position); 
  } 
  @Override 
  public long getItemId(int position) { 
    return getItem(position).id; 
  } 
  @Override 
  public View getView(int position, View convertView, ViewGroup parent) { 
    ViewHolder holder; 
    if (convertView == null) { 
      holder = new ViewHolder(); 
      convertView = mInflater.inflate(R.layout.list_item, null); 
      holder.avator=(ImageView)convertView.findViewById(R.id.avator); 
      holder.name=(TextView)convertView.findViewById(R.id.name); 
      holder.content = (TextView) convertView.findViewById(R.id.content); 
      holder.gridView=(NoScrollGridView)convertView.findViewById(R.id.gridView); 
      convertView.setTag(holder); 
    } else { 
      holder = (ViewHolder) convertView.getTag(); 
    } 
    final MyBean bean = getItem(position); 
    //加载网络图片 
    ImageLoader.getInstance().displayImage(bean.avator, holder.avator); 
    holder.name.setText(bean.name); 
    holder.content.setText(bean.content); 
    if(bean.urls!=null&&bean.urls.length>0){ 
      holder.gridView.setVisibility(View.VISIBLE); 
      holder.gridView.setAdapter(new DynamicGridAdapter(bean.urls, mContext)); 
      holder.gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
        @Override 
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
          imageBrower(position,bean.urls); 
        } 
      }); 
    }else{ 
      holder.gridView.setVisibility(View.GONE); 
    } 
    return convertView; 
  } 
  private void imageBrower(int position, String[] urls) { 
    Intent intent = new Intent(mContext, ImagePagerActivity.class); 
    // 图片url,为了演示这里使用常量，一般从数据库中或网络中获取 
    intent.putExtra(ImagePagerActivity.EXTRA_IMAGE_URLS, urls); 
    intent.putExtra(ImagePagerActivity.EXTRA_IMAGE_INDEX, position); 
    mContext.startActivity(intent); 
  } 
  // 优化listview 
  private static class ViewHolder { 
    public TextView name; 
    public ImageView avator; 
    TextView content; 
    NoScrollGridView gridView; 
  } 
}

2 主界面

实际项目中数据是数据是从服务器获取的，本次就只将图片从网络获取，

public class MainActivity extends ListActivity { 
  public static final String TAG = "MainActivity"; 
  private FridListAdapter mAdapter; 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    new LoderDataTask().execute(); 
  } 
  class LoderDataTask extends AsyncTask<Void, Void, MessageModle> { 
    @Override 
    protected MessageModle doInBackground(Void... params) { 
      Gson gson = new Gson(); 
      MessageModle msg = gson.fromJson(getData(), MessageModle.class); 
      return msg; 
    } 
    @Override 
    protected void onPostExecute(MessageModle result) { 
      mAdapter = new FridListAdapter(MainActivity.this, result.list); 
      setListAdapter(mAdapter); 
    } 
  } 
  private String getData() { 
    // 模拟网络获取数据 
    String json = "{\"code\":200,\"msg\":\"ok\",list:[" 
        + "{\"id\":110,\"avator\":\"http://img0.bdstatic.com/img/image/shouye/leimu/mingxing.jpg\",\"name\":\"赵薇\",\"content\":\"今天不开心!\",\"urls\":[]}," 
        + "{\"id\":111,\"avator\":\"http://image.cnwest.com/attachement/jpg/site1/20110507/001372d8a36f0f2f4c953a.jpg\",\"name\":\"李晨\",\"content\":\"我们\"," 
        + " \"urls\":[\"http://guangdong.sinaimg.cn/2015/0530/U11307P693DT20150530094310.jpg\"]}," 
        + "{\"id\":114,\"avator\":\"http://img.hexun.com/2009-05-01/117287830.jpg\",\"name\":\"小马哥\",\"content\":\"今天淘宝了吗\",\"urls\":[" 
        + "\"http://g.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=ccd33b46d53f8794d7ff4b26e2207fc9/0d338744ebf81a4c0f993437d62a6059242da6a1.jpg\"," 
        + "\"http://f.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=6b62f61bac6eddc422e7b7f309e0c7c0/6159252dd42a2834510deef55ab5c9ea14cebfa1.jpg\"," 
        + "\"http://g.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=e58fb67bc8ea15ce45eee301863b4bce/a5c27d1ed21b0ef4fd6140a0dcc451da80cb3e47.jpg\"," 
        + "\"http://c.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=cdab1512d000baa1be2c44b3772bc82f/91529822720e0cf3855c96050b46f21fbf09aaa1.jpg\"]}," 
        + "{\"id\":112,\"avator\":\"http://img3.yxlady.com/yl/UploadFiles_5361/20150528/20150528050208705.jpg\",\"name\":\"邓超\",\"content\":\"奔跑吧兄弟！ 欢迎收看！\",\"urls\":[\"http://upload.cbg.cn/2015/0305/1425518659246.jpg\"," 
        + "\"http://www.people.com.cn/mediafile/pic/20150619/30/4179219540177204330.jpg\"]}," 
        + "{\"id\":113,\"avator\":\"http://img4.imgtn.bdimg.com/it/u=945108765,1070109457&fm=21&gp=0.jpg\",\"name\":\"奥巴马\",\"content\":\"holle\",\"urls\":[\"http://f.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=6b62f61bac6eddc422e7b7f309e0c7c0/6159252dd42a2834510deef55ab5c9ea14cebfa1.jpg\",\"http://g.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=e58fb67bc8ea15ce45eee301863b4bce/a5c27d1ed21b0ef4fd6140a0dcc451da80cb3e47.jpg\",\"http://c.hiphotos.bdimg.com/album/s%3D680%3Bq%3D90/sign=cdab1512d000baa1be2c44b3772bc82f/91529822720e0cf3855c96050b46f21fbf09aaa1.jpg\"]}]}"; 
    return json; 
  }

3 GridView的Adapter

因为Listview的条目中包含Gridview,在这里还需要为它创建atapter

由于adapter没太多技术含量，因此重点部分列出，在这里我们需要判断下适配的数据眼总数，微信最大数是9张，显示一张的时候，图片比较大，两张的时候稍微减少，四张的时候两列两行和两张的大小一致，其他张数的时候都是三行三列的九宫格。

@Override 
  public View getView(int position, View convertView, ViewGroup parent) { 
    MyGridViewHolder viewHolder; 
    if (convertView == null) { 
      viewHolder = new MyGridViewHolder(); 
      convertView = mLayoutInflater.inflate(R.layout.gridview_item, 
          parent, false); 
      viewHolder.imageView = (ImageView) convertView 
          .findViewById(R.id.album_image); 
      convertView.setTag(viewHolder); 
    } else { 
      viewHolder = (MyGridViewHolder) convertView.getTag(); 
    } 
    String url = getItem(position); 
    if (getCount() == 1) { 
      viewHolder.imageView.setLayoutParams(new android.widget.AbsListView.LayoutParams(300, 250)); 
    } 
    if (getCount() == 2 ||getCount() == 4) { 
      viewHolder.imageView.setLayoutParams(new android.widget.AbsListView.LayoutParams(200, 200)); 
    } 
    ImageLoader.getInstance().displayImage(url, viewHolder.imageView); 
    return convertView; 
  }

4 新建用于支持九宫格自定义的Gridview

public class NoScrollGridView extends GridView { 
  public NoScrollGridView(Context context) { 
    super(context); 
  } 
  public NoScrollGridView(Context context, AttributeSet attrs) { 
    super(context, attrs); 
  } 
  @Override 
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
    int expandSpec = 0; 
    int size = getAdapter().getCount(); 
    if (size == 1) { 
      setNumColumns(1); 
    }  
    if ( size==2 || size == 4 ) { 
      setNumColumns(2); 
    } 
    else { 
      setNumColumns(3); 
    } 
    expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,MeasureSpec.AT_MOST); 
    super.onMeasure(widthMeasureSpec,expandSpec ); 
  } 
}

三点击图片后的基础类

1 建立大图查看器viewpaer

public class ImagePagerActivity extends FragmentActivity { 
  private static final String STATE_POSITION = "STATE_POSITION"; 
  public static final String EXTRA_IMAGE_INDEX = "image_index"; 
  public static final String EXTRA_IMAGE_URLS = "image_urls"; 
  private HackyViewPager mPager; 
  private int pagerPosition; 
  private TextView indicator; 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.image_detail_pager); 
    pagerPosition = getIntent().getIntExtra(EXTRA_IMAGE_INDEX, 0); 
    String[] urls = getIntent().getStringArrayExtra(EXTRA_IMAGE_URLS); 
    mPager = (HackyViewPager) findViewById(R.id.pager); 
    ImagePagerAdapter mAdapter = new ImagePagerAdapter( 
        getSupportFragmentManager(), urls); 
    mPager.setAdapter(mAdapter); 
    indicator = (TextView) findViewById(R.id.indicator); 
    CharSequence text = getString(R.string.viewpager_indicator, 1, mPager 
        .getAdapter().getCount()); 
    indicator.setText(text); 
    // 更新下标 
    mPager.setOnPageChangeListener(new OnPageChangeListener() { 
      @Override 
      public void onPageScrollStateChanged(int arg0) { 
      } 
      @Override 
      public void onPageScrolled(int arg0, float arg1, int arg2) { 
      } 
      @Override 
      public void onPageSelected(int arg0) { 
        CharSequence text = getString(R.string.viewpager_indicator, 
            arg0 + 1, mPager.getAdapter().getCount()); 
        indicator.setText(text); 
      } 
    }); 
    if (savedInstanceState != null) { 
      pagerPosition = savedInstanceState.getInt(STATE_POSITION); 
    } 
    mPager.setCurrentItem(pagerPosition); 
  } 
  @Override 
  public void onSaveInstanceState(Bundle outState) { 
    outState.putInt(STATE_POSITION, mPager.getCurrentItem()); 
  } 
  private class ImagePagerAdapter extends FragmentStatePagerAdapter { 
    public String[] fileList; 
    public ImagePagerAdapter(FragmentManager fm, String[] fileList) { 
      super(fm); 
      this.fileList = fileList; 
    } 
    @Override 
    public int getCount() { 
      return fileList == null ? 0 : fileList.length; 
    } 
    @Override 
    public Fragment getItem(int position) { 
      String url = fileList[position]; 
      return ImageDetailFragment.newInstance(url); 
    } 
  }

2 查看大图界面

public class ImageDetailFragment extends Fragment { 
  private String mImageUrl; 
  private ImageView mImageView; 
  private ProgressBar progressBar; 
  private PhotoViewAttacher mAttacher; 
  public static ImageDetailFragment newInstance(String imageUrl) { 
    final ImageDetailFragment f = new ImageDetailFragment(); 
    final Bundle args = new Bundle(); 
    args.putString("url", imageUrl); 
    f.setArguments(args); 
    return f; 
  } 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    mImageUrl = getArguments() != null ? getArguments().getString("url") : null; 
  } 
  @Override 
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    final View v = inflater.inflate(R.layout.image_detail_fragment, container, false); 
    mImageView = (ImageView) v.findViewById(R.id.image); 
    mAttacher = new PhotoViewAttacher(mImageView); 
    mAttacher.setOnPhotoTapListener(new OnPhotoTapListener() { 
      @Override 
      public void onPhotoTap(View arg0, float arg1, float arg2) { 
        getActivity().finish(); 
      } 
    }); 
    progressBar = (ProgressBar) v.findViewById(R.id.loading); 
    return v; 
  } 
  @Override 
  public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 
    ImageLoader.getInstance().displayImage(mImageUrl, mImageView, new SimpleImageLoadingListener() { 
      @Override 
      public void onLoadingStarted(String imageUri, View view) { 
        progressBar.setVisibility(View.VISIBLE); 
      } 
      @Override 
      public void onLoadingFailed(String imageUri, View view, FailReason failReason) { 
        String message = null; 
        switch (failReason.getType()) { 
        case IO_ERROR: 
          message = "下载错误"; 
          break; 
        case DECODING_ERROR: 
          message = "图片无法显示"; 
          break; 
        case NETWORK_DENIED: 
          message = "网络有问题，无法下载"; 
          break; 
        case OUT_OF_MEMORY: 
          message = "图片太大无法显示"; 
          break; 
        case UNKNOWN: 
          message = "未知的错误"; 
          break; 
        } 
        Toast.makeText(getActivity(), message, Toast.LENGTH_SHORT).show(); 
        progressBar.setVisibility(View.GONE); 
      } 
      @Override 
      public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) { 
        progressBar.setVisibility(View.GONE); 
        mAttacher.update(); 
      } 
    }); 
  }

四界面的头像圆形

圆形头像用主流的circleimageview.jar的框架，但是有兴趣的朋友也可以自定义Imagview采用重写onDrawI()画圆形的方式将bitmap画上去，由于此demo整体功能较复杂，因此使用第三方的东西，ListView条目布局如下：

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  xmlns:tools="http://schemas.android.com/tools" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:padding="6dp" > 
  <de.hdodenhof.circleimageview.CircleImageView 
    android:id="@+id/avator" 
    android:layout_width="48dp" 
    android:layout_height="48dp" 
    android:src="@drawable/empty_photo" /> 
  <TextView 
    android:id="@+id/name" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginLeft="10dp" 
    android:layout_toRightOf="@id/avator" 
    android:textColor="#576B95" 
    android:textSize="16sp" 
    android:text="name" /> 
  <TextView 
    android:id="@+id/content" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/name" 
    android:layout_marginLeft="10dp" 
    android:textSize="12sp" 
    android:layout_toRightOf="@id/avator" 
    android:text="content" /> 
  <com.loveplusplus.demo.image.NoScrollGridView 
    android:id="@+id/gridView" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:paddingTop="5dp" 
    android:layout_below="@id/content" 
    android:layout_marginLeft="10dp" 
    android:layout_toRightOf="@id/avator" 
    android:horizontalSpacing="1dp" 
    android:numColumns="3" 
    android:visibility="gone" 
    android:verticalSpacing="1dp" /> 
</RelativeLayout>

接下来我们还需要将主流的photoView.jar加入到工程中，

总结一下实现以上功能我们使用了第三的imagloader，支持手势缩放的PhotoView,圆形图像的circleimageView，熟悉安卓view绘制机制加载过程，事件传递和分发的朋友是不需要第三方开源项目的支持的，但是对于入门不久的同学，学会怎样使用开源框架就可以，但是想要提高开源项目的的核心还是需要了解的，欢迎阅读

运行效果图：

有兴趣的朋友建议阅读下：

安卓事件机制（一）和上篇关于View的博文。谢谢交流和分享。

demo源码下载地址：https://github.com/Tamicer/CHatMomentDemo

以上所述是小编给大家介绍的Android 高仿微信朋友圈动态支持双击手势放大并滑动查看图片效果，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对呐喊教程网站的支持！

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基础教程